/Engine/Source/Runtime/Slate/Public/Widgets/Layout/SRadialBox.h
If we need a section of a radial (for example half-a-radial) we can define a central angle < 360 (180 in case of half-a-radial). Used when bDistributeItemsEvenly is enabled.
WidgetArgsType & SectorCentralAngle &40; float InArg &41;